Jean bergmann



Dec. 29 1925.

J. BERGMANN CALCULATING DEVICE Filed Oct. 20, 1923 the length of the shorter arms.

Patented Dec. 29, 1925.

. UNITED STATES JEAN BERGMANN, OF WANNSEE-BERLIN, GERMANY.

CALCULATING DEVICE.

Application filed October 20, 1923. Serial No. 669,791.

To all whom it may concern:

Be it known that I, JEAN BERGMANN, a. citizen of the German Republic, residing at Wannsee-Berlin, Germany, have invented certain new and useful Improvements in Calculating Devices, of which the following is a specification.

This invention relates to a calculating machine with figure slides and tens transfer means operated by feed wheels having each four teeth. According to the invention the four-teeth feed wheels are connected each by an intermediate axle with toothed wheels having a large number of teeth which gear with a rack provided on the next following slide. By this arrangement a smoother and more precise action than was hitherto possible is ensured. Blade springs work preferably together with the racks or with the corresponding figure slide so that. even when at a transmission of tens the calculating pin is not brought exactly to the end of its travel, the slide will be brought to its accurate position by said blade spring. The rack is preferably guided with I-shaped guide pieces in a slot in the intermediate plate. The arms of the guide pieces are shorter on the one side of the intermediate plate than on the other side and the guide recesses have lateral slits corresponding to In this manner it is possible for the racks to be directly inserted in the guide slot at one end thereof and to be secured in their position by displacement relative to the recesses. The end position in which the rack is inserted is preferably selected so that it is not reached by the working of the apparatus.

With a View to simple, cheap and easy assembly the figure slide may be assembled with the rack by dove-tailed connections so that it can be pushed from the side upon the rack.

The apparatus casing may have a hingedly subdivided cover plate adapted to be slidably displaced relative thereto. This cover plate permits the elimination of a special receptacle for the adding mechanism. When the cover plate is completely pushed over the adding mechanism this mechanism is fully protected. When the adding mechanism is to be used the cover plate is pulled off until one of the hingedly connected parts of the cover plate is released so that it can be placed under the adding mechanism in such a manner as not to disturb the working of the. same. When the apparatus is constructed accordingly, especially when suitable abutments are provided. the part of the cover plate below the adding mechanism may be maintained in inclined position with regard to the adding mechanism so that the adding mechanism mounted on this part of the cover plate is inclined in upward direction llke a desk, wherebythe handling of the adding device is considerably facilitated. A flange of the cover plate may serve for accommodating an adjusting pin.

The nvention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part of this specification, with the understanding that while in the drawings one embodiment of the invention is disclosed, the invention is not confined to any strict conformity with the showing of the drawings but may be embodied in any manner which does not make a material departure fro he salient features of the invention.

In the drawing Fig. 1 is a top plan view showing part of the machine, the cover plate being broken off at the right hand part to show the intermediate plate with two slides and the feed wheel.

Fig. 2 is a view from below of the intermediate plate.

3 is a side'elevation of Fig. 2.

Fig. 4 is a cross section through the rack.

Fig. 5 shows in side elevation the end of the rack.

Fig. 6 is a top plan view of the end of the rack.

Fig. 7 is a perspective view of the calculating machine.

The intermediate plate 1 has longitudinal slots 2 from which short lateral recesses 3 branch off for a purpose to be explained hereinafter. The racks 4 (Fig. 2) are guided in the longitudinal slots 2 by the I-shaped heads at either end. The heads of the racks comprise two long arms 5 and two short arms 6. The length of the short arms 6 corresponds with the depth of the lateral recesses 8 in the intermediate plate so that the arms 6 may be inserted in the lateral recesses 3 until the arms 5 rest upon the intermediate plate. By displacement in longitudinal direction the cross arms are brought out of engagement with the lateral recesses so that the rack is again securely plate 1 and carry on one of their ends the four-teeth feed wheels 14: and on the other end the pinions 15. These pinions 15 engage with the teeth of the racks 8. The feed wheel, however, is operated in conjunction with another slide than that controlled by its corresponding pinion. While for instance the feed wheel 14 situated in Fig. 1 at the right works together with the slide 11 at the right in Fig. 1, the corresponding toothed wheel 15 gears with the rack of the slide 11 at the left of Fig. 1.

The number of slides corresponds with the number of places of the corresponding calculating machine. The cover plate has as usual guide slots for the calculating pins. The calculating apparatus has also the usual auxiliary means; for instance, the slides may have contrastingly colored ortions for indicating the directions in w ich they are to be operated.

The operation is as follows If at one place a 7 has to be entered for instance, the calculating pin is inserted in the gap between teeth of the slide corresponding with said place and the slide is pulled down until at the zero it strikes against the lower edge of the slot of the cover plate, whereupon the 7 appears in the window 16. If now a 6, for instance, has to be added, the pin is inserted in the ap between teeth at the side of the 6 and pushed upward indicated by the color of said teeth until it strikes against the upper end of the slot. The stud when moving upward revolves the feed wheel 14: just before it abuts the top of the slot so that the pinion 15 connected with said teed wheel is rotated. This toothed wheel 14% gears with the rack 7 of the neighbouring slide 11 and advances this neighbouring slide for one place. In the first window 16 the figure 3 now appears and in the neighbouring window 16 the figure 1.

The caluculating apparatus has a cover plate consisting of two hingedly connected parts 6 and 6 The cover late is guided on the adding mechanism y the lateral flanges c. The movement of the cover plate may be limited bj; stops on the back wall of the adding mec anism. \Vhen, as shown in Fig. 7, the cover plate is pulled oil? the adding a paratus to the extent of one of said port1ons (b the calculating slots 17 of the apparatus are revealed. The part b, of the cover plate may in this position be turned over u on the rear of the apparatus, so that the e ges g of the flanges 0 come in contact with the back of the calculating apparatus and maintain the part b in an inclined position with regard to the adding apparatus. If the adding apparatus is now placed upon the upper surface of part b of the cover plate the adding a aratus stands in inclined position upward y directed so that it is easy to manipulate. The free end of the cover plate b has a flan e it behind which the pin for operating t e slides 11 may be accommodated. When the cover plate is pushed over the adding apparatus the pin is securely held in the space between flange h and cover plate 6 in which it is enclosed by the lower edge of the calculating apparatus.

I claim 1. In a calculating device of the kind as described, a plate provided with adjacent slots, graduated slides reciprocable in said slots, racks on said slides, multi-tooth pinions in engagment with said racks, and a star wheel in fixed relation to each of said pinions, whereby, said star wheels being rotated during a computing process, their correlated slides are advanced through a graduated degree.

2. In a calculating device of the kind as described, a plate provided with adjacent slots, graduated slides reciprocable in said slots, racks on said slides, multi-tooth pinions in engagement with said racks, axles for said pinions fixed thereto and extending through said plate, and star wheels fixed on said axles on the opposite side of said late to said pinions, whereby, said star w eels being rotated during a computing their correlated slides are advanced t rough a graduated degree.

3. In a calculating device of the kind as described, a plate provided with adjacent slots, graduated slides adapted for insertion in said slots, said slides having I-shaped guide heads for engaging said plate at opposite edges of said slots, and lateral recesses in said slots for allowing the insertion of said guide heads.

In testimony whereof I aflix my signature.

JEAN BERGMANN.

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